Merge pull request #16222 from hannesa2:AndroidMoveVersionInfo

Android move version info to Gradle style

* move version info to Gradle style

* Use VERSION_NAME in loader

* apply review suggestion

modules/java/android_sdk/android_gradle_lib/AndroidManifest.xml

@@ -1,6 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-      package="org.opencv"
-      android:versionCode="@OPENCV_VERSION_MAJOR@@OPENCV_VERSION_MINOR@@OPENCV_VERSION_PATCH@0"
-      android:versionName="@OPENCV_VERSION@">
+      package="org.opencv" >
 </manifest>

modules/java/android_sdk/android_gradle_lib/build.gradle

@@ -1,13 +1,18 @@
 apply plugin: 'com.android.library'
 
+def openCVersionName = "@OPENCV_VERSION@"
+def openCVersionCode = ((@OPENCV_VERSION_MAJOR@ * 100 + @OPENCV_VERSION_MINOR@) * 100 + @OPENCV_VERSION_PATCH@) * 10 + 0
+
 android {
     compileSdkVersion @ANDROID_COMPILE_SDK_VERSION@
-    //buildToolsVersion "x.y.z" // not needed since com.android.tools.build:gradle:3.0.0
 
     defaultConfig {
         minSdkVersion @ANDROID_MIN_SDK_VERSION@
         targetSdkVersion @ANDROID_TARGET_SDK_VERSION@
 
+        versionCode openCVersionCode
+        versionName openCVersionName
+
         externalNativeBuild {
             cmake {
                 arguments "-DANDROID_STL=@ANDROID_STL@"